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Ruby Documentation http://www.ruby-doc.org/
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Learn Ruby by Codecademy http://www.codecademy.com/en/tracks/ruby
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Learn Ruby the Hard Way http://learncodethehardway.org/ruby/
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Eloquent Ruby: Russ Olsen http://eloquentruby.com/
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Courses on: https://www.codemy.net/posts
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Clean Ruby - Jim Gay http://clean-ruby.com/
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Rails Guides http://guides.rubyonrails.org/
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Ruby on Rails Tuturial: Michael Hartl https://www.railstutorial.org/book
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Learn Ruby on Rails: Daniel Kehoe https://github.com/RailsApps/learn-rails
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Crafting Rails 4 Applications: Jose Valim https://pragprog.com/book/jvrails2/crafting-rails-4-applications
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Courses on: https://www.codemy.net/posts
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The Rails View: John Athayde and Bruce Williams https://pragprog.com/book/warv/the-rails-view
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Rails Recipes: Chad Fowler https://pragprog.com/book/rr2/rails-recipes
- Clean Code: Robert C. Martin <hard copy or: http://www.amazon.com/Clean-Code-Handbook-Software-Craftsmanship/dp/0132350882 >
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Koans by Jim Weirich http://rubykoans.com/
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Exercism by Katrina Owen http://www.exercism.io/
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Ruby Rogues Podcast http://devchat.tv/ruby-rogues/
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Unix philosopht http://www.faqs.org/docs/artu/ch01s06.html
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Learn to type fast http://www.keybr.com/
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Interactive SQL tutorial http://sqlzoo.net/wiki/Main_Page
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Pull Review https://www.pullreview.com/